Topic 1 - Key Concepts of Physics

Question 1

State all the SI units

Answer 1

• Metre, m
• Kilogram, kg
• Second, s
• Ampere, A (current)
• Kelvin, K
• Mole, mol
• Volt, V
  -Frequency, hertz, Hz
  -Force, newton, N
  -Energy, joule, J
  -Power, watt, W
  -Pressure, pascal, Pa
  -Charge, coulomb, C, Resistance, ohm, Ω
  -Magnetic Flux Density, tesla, T

Question 2

State the units, their symbols and their values

Answer 2

giga G = x10⁹
mega M = x10⁶
kilo k = x10³
centi c = x10⎺²
mili m = x10⎺³
micro μ = x10⎺⁶
nano n = x10⎺⁹

Question 3

What is the equation for voltage?

Answer 3

Voltage = Current × Resistance = V = IR